Diagnostic testing instrument



FIG. 1 is a top, front and left side perspective view of our new design for a diagnostic testing instrument;

FIG. 2 is a top, front and right side perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a plan view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a left side elevation view thereof; and,

FIG. 7 is right side elevation view thereof. 

The design for a diagnostic testing instrument, as shown and described. 